Power Electronics - Online Test

Q1. For the circuit shown in the figure below, assume that diodes D1D2 and D3 are ideal.

The DC components of voltages v1 and v2, respectively are
Answer : Option B
Explaination / Solution:



Q2.
The input voltage VDC of the buck-boost converter shown below varies from 32 V to 72 V. Assume that all components are ideal, inductor current is continuous, and output voltage is ripple free. The range of duty ratio D of the converter for which the magnitude of the steady state output voltage remains constant at 48 V is

Answer : Option A
Explaination / Solution:



Q3. Assuming that the diodes in the given circuit are ideal, the voltage V0 is 

Answer : Option B
Explaination / Solution:
No Explaination.


Q4.
The power electronic converter shown in the figure has a single-pole double-throw switch. The pole P of the switch is connected alternately to throws A and B. The converter shown is a _______

Answer : Option A
Explaination / Solution:
No Explaination.


Q5.
Figure shows a composite switch consisting of a power transistor (BJT) in series with a diode. Assuming that the transistor switch and the diode are ideal , the I-V characteristic of the composite switch is

Answer : Option C
Explaination / Solution:
No Explaination.


Q6.
The fully controlled thyristor converter in the figure is fed from a single-phase source. When the firing angle is 0°, the dc output voltage of the converter is 300V. What will be the output voltage for a firing angle of 60°, assuming continuous conduction?

Answer : Option A
Explaination / Solution:
No Explaination.


Q7. The transistor circuit shown uses a silicon transistor with VBE = 0.7V, IC ≈ IE and a dc current gain of 100. The value of V0 is

Answer : Option A
Explaination / Solution:
No Explaination.


Q8.
Answer : Option A
Explaination / Solution:

When diode is ON, i=1mA. When diode is OFF, i is zero after small reverse recovery time.

Q9. An SCR is considered to be a semi-controlled device because
Answer : Option C
Explaination / Solution:
No Explaination.


Q10. In the figure shown, all elements used are ideal. For time t<0, S1 remained closed and S2 open. At t = 0, S1 is opened and S2 is closed. If the voltage Vc2 across the capacitor C2 at t = 0 is zero, the voltage across the capacitor combination at t=0+ will be 

Answer : Option C
Explaination / Solution: